Results 31 to 40 of about 67,616 (299)
The Non-Vortex Inverse Propagation of Energy in a Tightly Focused High-Order Cylindrical Vector Beam
IEEE Photonics Journal, 2019 In this paper, the tight focusing of high-order cylindrical vector beams (beams with polarization singularity) was investigated. Using the Richards–Wolf formalism, there were obtained expressions for all projections of the electric and magnetic ...
Sergey S. Stafeev +3 more
doaj +1 more source
Multi-twist polarization ribbon topologies in highly-confined optical fields
New Journal of Physics, 2019 Electromagnetic plane waves, solutions to Maxwell’s equations, are said to be ‘transverse’ in vacuum. Namely, the waves’ oscillatory electric and magnetic fields are confined within a plane transverse to the waves’ propagation direction.
Thomas Bauer +8 more
doaj +1 more source
An orbital energy flow and a spin flow at the tight focus
Компьютерная оптика, 2021 We have shown that a reverse energy flow (negative projection of the Poynting vector onto the optical axis) at the sharp focus of an optical vortex with topological charge 2 and left-hand circular polarization arises because the axial spin flow has a ...
S.S. Stafeev
doaj +1 more source
Spin–Orbital Transformation in a Tight Focus of an Optical Vortex with Circular Polarization
Applied Sciences, 2023 In the framework of the Richards–Wolf formalism, the spin–orbit conversion upon tight focusing of an optical vortex with circular polarization is studied.
Victor V. Kotlyar +4 more
doaj +1 more source
Tight focusing of laser beams in a λ/2-microcavity
Optics Express, 2008 We evaluate the field distribution in the focal spot of the fundamental Gaussian beam as well as radially and azimuthally polarized doughnut beams focused inside a planar metallic sub-wavelength microcavity using a high numerical aperture objective lens.
Khoptyar, Dmitry +6 more
openaire +3 more sources
Toroidal polarization vortices in tightly focused beams with singularity
Компьютерная оптика, 2020 In this paper, we numerically investigated tight focusing of cylindrical vector beams of the sec-ond order using Richards-Wolf formulae. It was shown that intensity rings where the Poynting vector was equal to zero appeared not only in the focal plane ...
S.S. Stafeev, V.V. Kotlyar
doaj +1 more source
Tight focus of light using micropolarizer and microlens
, 2015 Funding: European Research Council (ERC) (337508); Ministry of Education and Science of the Russian Federation (MK-4816.2014.2, NSh-3970.2014.9); Russian Foundation for Basic Research (14-07-31092, 14-07-97039, 14-29-07133, 15-07-01174).Using a binary ...
Stafeev, S.S. +3 more
core +1 more source
Formation of an elongated region of energy backflow using ring apertures [PDF]
Компьютерная оптика, 2019 In this paper, we have investigated the focusing of a second-order cylindrical vector beam by using a high numerical aperture (NA) lens limited by a ring aperture using the Richards-Wolf formulae.
Sergey Stafeev, Victor Kotlyar
doaj +1 more source
Компьютерная оптика, 2022 Using a finite-difference time-domain method, it has been shown that focal spots generated when tightly focusing a linearly polarized Gaussian beam by a Fresnel zone plate (FZP) and when focusing a Gaussian beam with an embedded optical vortex by a ...
A.A. Savelyeva, E.S. Kozlova
doaj +1 more source
Absorption-limited high harmonic generation in the tight focusing regime
, 2022 Paper HW3C.3Phase-matched and absorption-limited HHG can be achieved despite tight focusing. We present theoretical considerations and observed a conversion efficiency of >10-6 in this regime of particular importance for high repetition rate ...
Rothhardt, Jan +5 more
core